How Did Artists Paint Without Mirrors?

Imagine you're drawing a picture of yourself, but you can't see your face, it's like trying to draw with your eyes closed! Artists used to paint without mirrors by using tricks like looking in water or holding up small hand mirrors to see just parts of their faces at a time. They also practiced a lot and had good memories for how they looked. Over time, they got really good at guessing what they looked like based on their feelings or by asking others.